snip
I tend to put more weight on Live Departure Boards or Realtime Trains
because the data is from Network Rail's systems and more likely to be
accurate.

Thanks for that (and for the further background you and others have set
out). Seems we shall have to start checking Live Departure Boards etc
on a phone or tablet when out rather than relying on the Live travel
news displays at tube stations.
--
Robin
reply to address is (meant to be) valid